A、 Find out which door has a fault and is closed.
B、 Make sure that which door has a failure.
C、 Find out which door has not closed.
答案：C
A、 Find out which door has a fault and is closed.
B、 Make sure that which door has a failure.
C、 Find out which door has not closed.
答案：C
A. “力臂”是物体重心到基准面的水平距离。
B. “力臂”是物体重心到参考面的垂直距离。
C. “力矩”是物体中心到参考基准面的距离。
A. Put a plug on the open end of each pipe.
B. On the opening of each pipe,put a cover.
C. Put a cover on the loose end of the pipe.
A. If a power supply system is independent to provide service to only one component or single- function system,it will be discussed together with the components or systems it serves.
B. When a power source services a singlecomponent,or serves a single functioning system,that power source will be included in the discussion of the component or system which it serves.
C. When a power supply is a complete component or single-function system,the device it serves is discussed separately from its own component or system.
A. 两个半圆形的挡板控制空气流。
B. 两个半导体的金属圈控制空气流。
C. 两个半圆形的金属圈控制空气流。
A. The emergency procedures check list should be in precise form.The list not only tells pilots which items to check,but also provides everything about operation details of systems.
B. The emergency procedures check list should be in complicated form.The list tells pilots which systems to be investigated.It also provides operation details of some systems.
C. The emergency procedures check list should be in brief form.The list tells pilots which items to be examined.It provides nothing about operation details of any system.
A. Use protective goggles when you do work on fire extinguishers.
B. Ensure that you wear protective clothes while performing tasks on fire extinguishers.
C. Use protective gloves when working on fire extinguishers
A. 如果探头互相碰触,它们就会失去磁性。
B. 如果两个探头互相接触,它们就会失效。
C. 如果探针互相撞击,它们就会被磁化。
A. For vocabulary,only main alternation are highlighted,minor alternations to many approved and not approved examples are not highlighted.
B. For wordlist,only major changes are highlighted,minor changes to various approved and not approved examples are not highlighted.
C. For vocabulary,only main alternation are prominent,minor alternations to many approved and not approved examples are not prominent.
A. 用湿布清洁后排座椅上的松散污渍。
B. 清除座椅上的污垢后用湿布擦拭。
C. 用湿布清除座椅上的所有松散污垢。
A. 在起飞和飞行期间,在发动机故障的情况下应对飞机采取相应措施。
B. 对于所有飞机在起飞和飞行过程中发生的所有发动机故障,应提供相应的程序。
C. 在起飞和飞行期间,对于飞机的各种发动机故障,应执行相应程序。
